JP6795737B2 - Fishing reef cleaning method and fishing reef cleaning equipment - Google Patents

Description

The present invention relates to a method for cleaning the surface of a fishing reef installed on the seabed in order to promote the breeding and growth of fish and marine organisms, and a fishing reef cleaning device.

In order to promote the breeding and growth of fish, shellfish, crustaceans, cephalopods, etc., fishing reefs are sunk on the seabed. Such reefs may be set up for specific marine life. For example, the fishing reef described in Patent Document 1 is made of concrete and is installed mainly for the purpose of breeding shellfish such as abalone and turban shell. Similarly, there are some concrete fishing reefs that are installed to provide a spawning ground for squid.

In such fishing reefs, untargeted marine organisms such as barnacles and sea squirts may adhere to the surface after a long period of time after being installed on the seabed, and the function for breeding of the target marine organisms may be lost. .. In such a state, it is desirable to exterminate non-target organisms on the surface of the fishing reef in order to restore the function and clean the surface of the reef shortly after installation.

As a method of cleaning the surface of the fishing reef, a method in which a diving worker approaches the fishing reef installed on the seabed and peels off and removes marine organisms on the surface using a grasped tool or the like can be considered. In addition, a method is conceivable in which the fishing reefs installed on the seabed are once raised above the sea surface, the marine organisms on the surface are exfoliated on board or on land, and then returned to the seabed.

Japanese Unexamined Patent Publication No. 2005-348658

However, the work of a submerged worker cleaning the surface of a fishing reef on the seabed requires a great deal of labor and is inefficient. In other words, it is difficult for workers to maintain their bodies in a stable state in the sea, and it is difficult to exfoliate organisms that are strongly attached to fishing reefs. In addition, the method of hoisting a fishing reef on the sea surface, cleaning it, and then returning it to the seabed requires work for lifting and re-installing it on the seabed, resulting in a large cost.

The present invention has been made in view of the above circumstances, and an object of the present invention is a method for cleaning a fishing reef that can efficiently remove marine organisms attached to a fishing reef installed on the seabed at a low cost. And to provide fishing reef cleaning equipment.

In order to solve the above problem, the invention according to claim 1 is installed so as to cover a box body in which the lower part is open and the entire lateral circumference and the upper part are closed so as to cover from above the fishing reef installed on the seabed. Provided is a method for cleaning a fishing reef so that the environment inside the box is in a state capable of killing marine organisms adhering to the surface of the fishing reef.

In the above invention, the state in which the environment inside the box can exterminate marine organisms adhering to the surface of the fishing reef is, for example, the following state.
(1) Air is press-fitted to lower the seawater surface in the box, and the part to be cleaned is held on the seawater surface in the box for a predetermined period. By exposing it to the air, it exterminates organisms that live in the sea.
(2) After injecting air to lower the seawater level inside the box and leaving the part to be cleaned exposed on the seawater level inside the box, high-temperature and high-pressure steam is injected into the box to set the temperature to a predetermined temperature. Hold time. By raising the temperature to a high temperature, marine organisms attached to the fishing reef are exterminated.
(3) Inject air and spray the extermination chemical with the fishing reef exposed on the sea surface inside the box. As the drug, an acidic solution, an alkaline solution or the like can be used.
(4) With the fishing reef below the sea level inside the box, a chemical for extermination is added to the seawater inside the box. A chemical is added to the seawater within the area isolated by the box to exterminate marine organisms attached to the fishing reef. When there is a risk that the chemical may affect the surrounding environment, the seawater in the box can be sucked and discharged after extermination, and the treatment can be performed to avoid the influence on the surrounding environment.
(5) With air pressed in and the fishing reef exposed on the sea surface inside the box, it is heated by a heater installed inside the box and kept at a predetermined temperature for a predetermined time. As the heater, for example, a halogen heater lamp, an infrared lamp, or the like can be used. It exterminates marine life by high temperature. (6) With air injected and the fishing reef exposed on the sea surface inside the box, the electromagnetic wave generator installed inside the box irradiates the surface of the fishing reef with electromagnetic waves. It heats the water contained in marine organisms. For example, microwaves of 2450 MHz are generated in the box and act on water molecules contained in marine organisms to heat them.
(7) In a state where air is press-fitted and the fishing reef is exposed on the seawater surface in the box, the seawater in the box is electrolyzed to generate chlorine gas in the box. Marine organisms exposed to the air are exterminated by chlorine gas.
(8) With the fishing reef below the sea level inside the box, the seawater inside the box is electrolyzed to generate sodium hypochlorite in the seawater inside the box. When seawater is electrolyzed, chlorine is generated at the anode and hydrogen is generated at the cathode, and sodium hydroxide is produced. The reaction between these produces sodium hypochlorite. In this way, marine organisms are exterminated by containing sodium hypochlorite in the seawater that immerses the fishing reef in the box.

In this method of cleaning the fishing reef, the box body can be suspended and supported from above the sea surface and lowered to the sea floor so as to cover the side and the upper side of the fishing reef installed on the sea floor. As a result, the limited area inside the box, that is, the periphery of the fishing reef, is isolated from the surrounding seawater. Therefore, the environment limited to the inside of the box can be adjusted to the state where marine organisms are exterminated, and the marine organisms attached to the fishing reef can be efficiently exterminated. In addition, the environment inside the box can be adjusted by operating from above the sea surface, and marine organisms adhering to the fishing reef are exterminated without diving work or by reducing diving work as much as possible. It becomes possible to do.

The invention according to claim 2 is a box having an open lower portion and capable of covering the entire lateral circumference and the upper side of a fishing reef installed on the seabed, and a suspending material for lifting or suspending the box from above the sea surface. A hanger to which the gas is joined, and a ventilation pipe for press-fitting gas into or discharging the gas from the inside of the box or the box installed on the seabed, which is suspended and supported under the sea surface. Provided is a reef cleaning device having a reef position detecting means for detecting the position of the reef in a state of being supported by the box and suspended above the reef installed on the seabed.

In this fish reef cleaning device, the box is installed so as to cover the fish reef installed on the seabed by operating from the sea surface while suspending and supporting it from the sea surface and lowering it, and detecting the position of the fish reef by the fish reef position detecting means. can do. Then, by installing the box body so as to cover the fishing reef on the seabed, the box body is isolated from the surrounding seawater, and a gas such as air or high-temperature steam can be introduced or discharged using a ventilation pipe. As a result, the environment inside the box placed on the seabed can be adjusted from above the sea surface, and marine organisms attached to the fishing reef can be exterminated inside the box while suppressing the influence on the surrounding environment. It becomes possible to make it an environment.

The invention according to claim 3 is the fish reef cleaning device according to claim 2, in which the box is installed so as to cover the entire lateral circumference and the upper side of the fish reef, and is exposed on the sea surface in the box. It shall have a means for exterminating the marine organisms adhering to the surface of the fish reef or the marine organisms adhering to the surface of the fish reef below the sea level in the box.

In this fishing reef cleaning device, marine organisms can be killed at an early stage by extermination means, and marine organisms attached to the fishing reef can be efficiently exterminated.

According to a fourth aspect of the present invention, in the fishing reef cleaning device according to the second or third aspect, a liquid, a gas, or a mixture of a liquid and a gas is injected into the inside of the box, or the liquid, the gas, and the liquid. It is assumed that there is a removing means for removing dead marine organisms on the surface of the reef by adding a granular solid to any of the mixture of gas and gas and injecting it.

Marine organisms that have died while adhering to a reef have less adhesive strength than when they were alive, and the removal means of this reef cleaning device is a liquid, gas, or a mixture of liquid and gas, or granular to them. By adding and injecting the solid of the above, the dead marine organisms that remain attached to the surface of the fishing reef are efficiently removed.

As described above, the method for cleaning a fishing reef of the present invention can efficiently exterminate marine organisms adhering to the fishing reef without diving to the seabed and performing a lot of work. Further, the fish reef cleaning device of the present invention can cover the fish reef installed on the seabed with a box body and efficiently remove the marine organisms adhering to the fish reef at a low cost.

It is a schematic side view and the schematic plan view which shows the example of the fishing reef to which the cleaning method of the fishing reef which concerns on this invention can apply. It is sectional drawing which shows the outline of the cleaning method of the fishing reef which concerns on this invention. It is a schematic sectional drawing which shows one embodiment of the method for cleaning a fish reef which concerns on this invention, and shows the state which exterminates the marine life attached to a fish reef by using the fish reef cleaning device which is one Embodiment of this invention. It is a schematic cross-sectional view which shows the state which exterminates the marine organisms adhering to the fish reef by using another embodiment of the fish reef cleaning device which concerns on this invention. It is schematic cross-sectional view which shows the state which exterminates the marine organisms adhering to a fish reef by using another embodiment of the fish reef cleaning device which concerns on this invention. It is schematic cross-sectional view which shows the state which exterminates the marine organisms adhering to a fish reef by using another embodiment of the fish reef cleaning device which concerns on this invention. It is schematic cross-sectional view which shows the state which exterminates the marine organisms adhering to a fish reef by using another embodiment of the fish reef cleaning device which concerns on this invention. It is schematic cross-sectional view which shows the state which exterminates the marine organisms adhering to a fish reef by using another embodiment of the fish reef cleaning device which concerns on this invention. It is schematic cross-sectional view which shows the state which exterminates the marine organisms adhering to a fish reef by using another embodiment of the fish reef cleaning device which concerns on this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic side view and a schematic plan view showing a state in which a fishing reef that can be cleaned by the fishing reef cleaning method according to the present invention is installed on the seabed.
As shown in FIG. 1A, a plurality of fishing reef blocks 2 having a plate-shaped portion 2a and leg portions 2b made of reinforced concrete are stacked and installed in the fishing reef 1.

The plate-shaped portion 2a of the fishing reef block 2 has a substantially rectangular planar shape and is supported substantially horizontally by the leg portions 2b. The leg portion 2b is provided so as to protrude downward from the four corner portions of the plate-shaped portion 2a. A notch 2c is provided in the upper part of the portion where the leg portion 2b is provided, and the lower end of the leg portion 2b provided in another fishing reef block 2 having the same shape can be fitted. Thus, reef blocks _2-2 of one or more of the same shape on one of the reef block 2 _-1 installed in seabed, a 2 _-3, can be stacked in a stable state. Note that the upper layer of the reef blocks _2-2 and lower reef block 2 _-1 stacked, ligated with previously implanted in that anchor bolt (not shown) or the like, the upper layer for reef by waves and tidal current the the block _2-2 and lower reef block 2 _-1 to prevent the separation is desirable.

In the method for cleaning a fish reef according to the present invention, as shown in FIG. 2, the fish reef cleaning device 10 having a box 11 whose lower part is open from above the fish reef 1 already installed on the seabed is lowered to lower the fish reef 1. Install so that the sides and the top are covered with the box 11. Then, the fishing reef 1 is isolated from the surrounding marine environment, and the inside of the box 11 is exterminated so that the marine organisms attached to the fishing reef 1 cannot grow.

FIG. 3 is a schematic cross-sectional view showing a state in which the surface of a fishing reef is cleaned by using the fishing reef cleaning device according to the embodiment of the present invention.
The fishing reef cleaning device 10 supplies air to the box body 11, which is a hollow rectangular parallelepiped made of reinforced concrete and whose lower part is open, a hanging handle 12 for suspending and supporting the box body 11. Alternatively, a ventilation pipe 13 capable of discharging from the box, a steam supply pipe 14 for supplying high-temperature and high-pressure steam from above the sea surface into the box, and a downward monitoring camera 15 attached to the box to photograph the lower part. It has.

The box 11 has an inner dimension that can completely cover the sides and the upper part of the fishing reef 1 installed on the seabed. And even when the inside of the box 11 is occupied by air or other gas, it has a mass that does not float due to buoyancy. Further, it has a strength that can withstand the difference between the internal pressure when the inside of the box 11 is filled with gas and the water pressure acting from the outside.

A plurality of the hanging straps 12 are provided, the tip portion is embedded in the concrete of the upper part of the box, and the annular portion protrudes upward. The suspension member 5 can be locked to the annular portion via a suspension frame 4 that is wound up by the lifting machine 3.
The ventilation pipe 13 is provided with a connector 13b in which a pipe member 13a is embedded so as to penetrate the concrete at the upper part of the box and for connecting a hose 16 continuous to the sea surface. The hose 16 is connected to a device (not shown) capable of supplying high-pressure air such as a compressor installed on the sea surface.

Like the ventilation pipe 13, the steam supply pipe 14 has a pipe member 14a penetrating the concrete in the upper part of the box and a connector 14b to which the hose 17 is connected. The hose 17 is provided on the sea surface and has a high pressure. It is connected to a boiler (not shown) that supplies steam.
The steam supply pipe 14 may also be used as a ventilation pipe 13 without being provided, and the connection destination of the hose 16 may be switched to either a compressor or a boiler on the sea surface for connection.

The downward monitoring camera 15 can photograph the lower state in seawater and immediately display the captured image on a monitor (not shown) provided on the sea surface, and functions as a fishing reef position detecting means. It is something to do. With this downward monitoring camera 15, when the box body 11 is suspended and supported and lowered toward the seabed, the position of the fishing reef 1 installed on the seabed can be confirmed.
These downward monitoring cameras 15 are attached to the outer side surface of the box 11 to take a picture of the lower side, and directly below the box 11 attached to the upper surface inside the box 11 and supported by suspension. An internal camera 15b for taking pictures is provided.

A method of cleaning an already installed fishing reef using such a fishing reef cleaning device 10 can be carried out in the following steps.
The fishing reef cleaning device 10 is transported on the sea surface at a position where the fishing reef is installed by a pontoon or the like, and is lifted by a lifting machine 3 and lowered into seawater as shown in FIG. At this time, the position of the fishing reef 1 is confirmed by photographing the lower state with the downward monitoring camera 15. Then, the position of the fishing reef cleaning device 10 suspended and supported by the operation of the lifting machine 3 is aligned with the position directly above the position where the fishing reef 1 is installed. Further, when the plane shape of the fishing reef 1 is rectangular as shown in FIG. 1 and the box body 11 is manufactured in accordance with this, the direction adjusting device 7 attached to the suspension frame 4 adjusts the direction of the box body. The box 11 can be adjusted and installed so as to cover from above the fishing reef 1.
As the direction adjusting device 7, for example, a device that injects compressed air in the horizontal direction to slowly rotate the box 11 around the hoisting suspension member 6 can be adopted.

As shown in FIG. 3, when the box 11 of the fish reef cleaning device 10 is installed so as to cover the fish reef 1, the position of the sea surface in the box 11 is determined by press-fitting compressed air from the ventilation pipe 13. Lower to near the bottom of. Air is taken into the box when the box 11 whose lower part is open is lifted and lowered on the sea surface, but as it is lowered, the volume decreases due to water pressure, and it is installed so as to cover the fishing reef. Occasionally, the reef is partially submerged in seawater. From such a state, compressed air is press-fitted through the ventilation pipe 13 so that the portion of the fishing reef 1 to be cleaned is exposed on the sea surface in the box 11, that is, in the air.

Subsequently, high-temperature and high-pressure steam is sent into the box 11 from the steam supply pipe 14. The steam is cooled and liquefied in the box 11, but the temperature inside the box 11 gradually rises to a temperature at which marine organisms such as sea squirts and barnacles adhering to the surface of the fishing reef 1 die. In this way, the high temperature state is maintained for a predetermined time to kill the marine organisms adhering to the surface of the fishing reef 1.
In order to prevent the pressure inside the box 11 from rising due to the injection of air or the supply of high-temperature and high-pressure steam into the box and the gas leaking through the lower end of the box 11, a predetermined value is provided from the lower end of the box. It is desirable to provide the pressure release hole 18 at the height position. As a result, it is possible to prevent the gas in the box from leaking so as to pass through the lower end of the box 11 and the installed box from becoming unstable.

After keeping the inside of the box 11 at a high temperature to kill the marine organisms attached to the fishing reef, the supply of steam is stopped and the box 11 is pulled up to the sea surface while adjusting the amount of air in the box. The marine organisms that have died while adhering to the reef 1 are exfoliated from the surface of the reef with the passage of time thereafter, and the cleaning of the reef 1 is completed.
In the fish reef cleaning device 10, the ventilation pipe 13 and the steam supply pipe 14 are separately provided, but when the ventilation pipe 13 is also used as the steam supply pipe, the inside of the box is formed by press-fitting air from the ventilation pipe 13. After adjusting the height of the seawater surface, the valve (not shown) provided in the air passage from the compressor is closed, and the valve (not shown) provided in the steam supply path from the boiler is opened to open the inside of the box. Can be in a high temperature state.
In addition, the fishing reef may be exposed to the air and left until the attached marine organisms die without supplying high-temperature and high-pressure steam, but in order to perform efficient cleaning, the steam should be supplied. It is desirable to do this or use the extermination means described below.

FIG. 4 is a schematic cross-sectional view showing a fishing reef cleaning device according to a second embodiment of the present invention and a state in which a fishing reef is cleaned using the cleaning device.
The fishing reef cleaning device 20 includes a box body 21 similar to the device 10 shown in FIG. 3, a hanging strap 22, a ventilation pipe 23, and a downward monitoring camera 25, and in addition to these, the upper part of the box body. Is equipped with a heating device 26. The heating device 26 functions as an extermination means, and does not include a steam supply pipe in the present embodiment.

As the heating device 26, for example, a halogen heater lamp, an infrared lamp, or the like can be used, and other heaters may be used. It is desirable that these heating devices 26 are waterproofed so as not to lose their functions even when immersed in seawater, but they are waterproofed by managing the inside of the box so that gas is always trapped. It can also be used without any treatment.

In such a fishing reef cleaning device 20, the fishing reef cleaning device 20 is suspended and supported from above the sea surface, and the box 21 is installed so as to cover the fishing reef 1 as in the case of using the device shown in FIG. Then, air is press-fitted from the ventilation pipe 23 to lower the sea level in the box 21 to expose the fishing reef 1 in the air inside the box. In this state, the heating device 26 is operated to heat the inside of the box 21. By raising the inside of the box 21 to a predetermined temperature, marine organisms adhering to the surface of the fishing reef 1 can be exterminated.

FIG. 5 is a schematic cross-sectional view showing a fishing reef cleaning device according to a third embodiment of the present invention and a state in which a fishing reef is cleaned using the cleaning device.
The fishing reef cleaning device 30 has an electromagnetic heating device 36 instead of the heating device 26 of the device shown in FIG.
As the electromagnetic heating device 36, for example, a device that radiates microwaves toward the inside of the box can be used. A microwave oven having a frequency widely used in a microwave oven or the like can be used, and the energy of the changing radiant electrolysis becomes heat to heat the object to be heated.
In this fishing reef cleaning device 30, similarly to the device shown in FIG. 4, the marine organisms adhering to the surface of the fishing reef 1 are directly heated and efficiently exterminated in a state where the fishing reef 1 is exposed in the air inside the box 31. be able to.

FIG. 6 is a schematic cross-sectional view showing a fishing reef cleaning device according to a fourth embodiment of the present invention and a state in which a fishing reef is cleaned using the cleaning device.
The fishing reef cleaning device 40 includes a box 41 similar to the device shown in FIG. 4 or 5, a hanging strap 42, a ventilation pipe 43, and a downward monitoring camera 45. In addition to these, the box It is provided with a chemical solution supply pipe 44 that can supply a chemical solution into the box from the upper part of the body 41 and functions as an extermination means, and a drainage pipe 46 that sucks and discharges seawater in the box.
Similar to the ventilation pipe 43, the chemical supply pipe 44 is provided so as to penetrate the upper part of the box 41 and open in the box, and the connector 44a for connecting to the hose 47 for feeding the chemical liquid adjusted on the sea surface. It has. As the chemical solution supplied from the chemical solution supply pipe, an acidic solution, an alkaline solution or the like can be used, and for example, acetic acid, a sodium hydroxide aqueous solution or the like can be used.
The drainage pipe 46 is provided so as to open at the lower part inside the box 41, and a connector 46a for connecting to the suction hose 48 is provided on the outside of the box 41. The suction hose 48 is connected to a suction pump (not shown) provided on the sea surface.

The reef can be cleaned as follows by using such a reef cleaning device.
The fishing reef cleaning device 40 is suspended and supported by a lifting machine 3 as shown in FIG. 2, lowered into the sea, and installed so that the box 41 covers the side and the upper side of the fishing reef 1 as shown in FIG. .. Then, the amount of air confined in the box 41 via the ventilation pipe 43 is adjusted, and the sea level in the box is adjusted so that the fishing reef 1 is immersed in seawater in the box. In this state, the chemical solution is supplied from the chemical solution supply pipe 44 and mixed with the seawater in the box. By immersing in seawater containing a chemical solution, marine organisms adhering to the surface of the fishing reef 1 are killed and exterminated.

After the fishing reef 1 is immersed in seawater containing a chemical solution in the box 41 and a predetermined time elapses, air is injected from the ventilation pipe 43 and the seawater in the box is sucked through the drain pipe 46 to suck the seawater in the box to the sea surface. Drain up. Seawater containing the discharged chemical solution is treated by neutralizing it. By recovering the seawater containing the chemical solution in this way, it is possible to suppress the chemical solution from affecting the surrounding marine environment.
After discharging the seawater containing the chemical solution from the inside of the box 41, the fishing reef cleaning device 40 is pulled up while adjusting the amount of air in the box to complete the cleaning of the fishing reef.

FIG. 7 is a schematic cross-sectional view showing a fish reef cleaning device according to a fifth embodiment of the present invention and a state in which a fish reef is cleaned using the cleaning device.
The fish reef cleaning device 50 includes a box 51 similar to the device shown in FIG. 6, a hanger 52, a ventilation pipe 53, a chemical solution supply pipe 54, and a downward monitoring camera 55. In the device 50, the chemical liquid ejection pipe 56 is connected to the tip of the chemical liquid supply pipe 54 in the box. The chemical solution ejection pipe 56 ejects the chemical solution from the nozzle 56a provided on the side of the fishing reef 1 in the box toward the fishing reef 1.
As the nozzle 56a, a nozzle that ejects a chemical solution from above can be used instead of a nozzle that ejects from the side of the fishing reef 1, or in addition to a nozzle that ejects from the side.

In this fishing reef cleaning device 50, after the box 51 is installed so as to cover the fishing reef 1, air is press-fitted through the ventilation pipe 53, and the fishing reef 1 is exposed to the air in the box 51. Lower the sea level. Then, the chemical solution supplied from the chemical solution supply pipe 54 is ejected from the nozzle 56a of the chemical solution injection pipe 56 and sprayed on the surface of the fishing reef 1. By the action of this chemical solution, marine organisms adhering to the surface of the fishing reef 1 are exterminated.
After that, the fishing reef cleaning device 50 may be pulled up above the sea surface while adjusting the amount of air in the box 51, but a drain pipe (not shown) similar to the device shown in FIG. 6 is provided and marine organisms using a chemical solution are provided. After the removal of the above, the sea level in the box may be raised by adjusting the amount of air in the box 51, and the fishing reef 1 may be immersed in the seawater in the box. Then, after washing out the chemical solution into seawater, the seawater in the box is sucked and drained through the drain pipe, so that the influence on the surrounding marine environment can be reduced.

FIG. 8 is a schematic cross-sectional view showing a fish reef cleaning device according to a sixth embodiment of the present invention and a state in which a fish reef is cleaned using the cleaning device.
The fishing reef cleaning device 60 includes a box body 61 similar to the device shown in FIG. 4 or 5, a hanging strap 62, a ventilation pipe 63, and a downward monitoring camera 65, and seawater is used instead of the heating means. It is provided with two electrodes 64a and 64b for electrolyzing the strap.
As shown in FIG. 8, the electrodes 64a and 64b are attached to the inside of the box 61, and the two electrodes are in contact with the seawater in the box 61 at positions separated from each other. A DC voltage is applied between these electrodes 64a and 64b from a power supply device on the sea surface via a conductive wire (not shown), and a potential difference is generated between the two electrodes 64a and 64b.

As shown in FIG. 2, the fishing reef cleaning device 60 is suspended and supported by a lifting machine 3, lowered into the sea, and installed so that the box 61 covers the side and the upper side of the fishing reef 1 as shown in FIG. .. Then, the amount of air trapped in the box is adjusted via the ventilation pipe 63, and the sea level in the box is adjusted so that the fishing reef 1 is immersed in seawater in the box 61. In this state, by applying a voltage between the two electrodes 64a and 64b, seawater is electrolyzed, chlorine is generated at the anode, hydrogen is generated at the cathode, and sodium hydroxide is generated. These react to generate sodium hypochlorite in seawater, which can suppress the growth of marine organisms attached to the fishing reef 1.
Further, when using this fishing reef cleaning device 60, a drain pipe similar to the device shown in FIG. 6 is provided, and after the electrolysis is completed, the seawater in the box is sucked and discharged through the drain pipe. It can also be processed on the surface of the sea.

FIG. 9 is a schematic cross-sectional view showing a fishing reef cleaning device according to a seventh embodiment of the present invention and a state in which a fishing reef is cleaned using the cleaning device.
The fishing reef cleaning device 70 includes a box body 71 similar to the device shown in FIG. 8, a hanger 72, a ventilation pipe 73, and a downward monitoring camera 75, and further, for electrolyzing seawater. Although the two electrodes 74a and 74b are provided, in the fishing reef cleaning device 70 shown in FIG. 9, the two electrodes 74a and 74b are provided at positions close to the lower ends in the box 71. These electrodes 74a and 74b are in contact with seawater even when the seawater surface in the box is lowered until the portion of the fishing reef 1 to be cleaned is exposed on the seawater surface.
Further, the fishing reef cleaning device 70 is provided with a high-pressure injection pipe 76, and injects high-pressure water supplied from the sea surface, high-pressure compressed air, or both of them toward the fishing reef 1 in the box 71. It has become.

In this fishing reef cleaning device 70, as shown in FIG. 9, the box 71 is installed so as to cover the side and the upper side of the fishing reef 1 installed on the seabed, and then confined in the box 71 via a ventilation pipe 73. The amount of air to be cleaned is adjusted, and the sea level in the box is lowered so that the area to be cleaned of the fishing reef 1 is exposed on the sea surface in the box 71. In this state, by applying a voltage between the two electrodes 74a and 74b, seawater is electrolyzed, chlorine is generated at the anode and hydrogen is generated at the cathode. Then, marine organisms are exterminated by the inclusion of chlorine in the air inside the box.
Further, when using this fishing reef cleaning device 70, a drain pipe similar to the device shown in FIG. 6 was provided, and after exterminating marine organisms, the sea level in the box was once raised and generated in seawater. After reacting sodium hydroxide with chlorine, seawater in the box can be sucked and discharged through a drain pipe and treated on the sea surface.

Further, after killing the marine organisms adhering to the surface of the fishing reef 1, the sea level in the box 71 is lowered, and high-pressure water or high-pressure compressed air or a mixture thereof is transferred from the high-pressure injection pipe 76 to the fishing reef 1. It can be sprayed toward and exfoliate dead marine life while still attached to the fishing reef. This enables efficient cleaning. Further, it is also possible to improve the effect of exfoliating dead marine organisms by mixing and injecting granular solids such as sand having an adjusted particle size.

Such a high-pressure injection pipe 76 can be adopted in any of the fishing reef cleaning devices 30, 40, 50, 60, 70 of FIGS. 3 to 8, and is attached to the fishing reef 1 by the means of each. After killing the marine organisms, the attached marine organisms can be peeled off by injection from the high pressure injection pipe 76.

The fishing reef cleaning method and the fishing reef cleaning device described above are embodiments of the present invention, and the present invention is not limited thereto. Therefore, it can be carried out with appropriate modifications within the scope of the present invention.
For example, in the above embodiment, the box body is made of reinforced concrete, but a metal such as steel can be used. In addition, the shape and dimensions can be appropriately designed according to the shape and dimensions of the fishing reef to be cleaned.
Further, as the fishing reef position detecting means of the fishing reef cleaning device according to the present invention, in addition to the above-mentioned downward monitoring camera, a device that detects the position of the fishing reef by transmitting ultrasonic waves into the water and detecting reflected waves is adopted. You can also do it.

1: Fishing reef, 2: Fishing reef block, 2a: Plate-shaped part, 2b: Leg, 2c: Notch, 3: Lifting machine, 4: Suspension frame, 5: Suspension material, 6: Hoisting suspension material, 7: Direction adjustment device,
10: Fishing reef cleaning device, 11: Box, 12: Hose, 13: Ventilation pipe, 13a: Pipe member, 13b: Connector, 14: Steam supply pipe, 14a: Pipe member, 14b: Connector, 15: Downward surveillance camera , 15a: External camera, 15b: Internal camera, 16: Hose, 17: Hose, 18: Pressure release hole,
20: Fishing reef cleaning device, 21: Box body, 22: Hanging strap, 23: Ventilation pipe, 25: Downward surveillance camera, 25a: External camera, 25b: Internal camera, 26: Heating device,
30: Fishing reef cleaning device, 31: Box body, 33: Ventilation pipe, 35: Downward surveillance camera, 36: Electromagnetic heating device,
40: Fishing reef cleaning device, 41: Box, 42: Hanger, 43: Ventilation pipe, 44: Chemical supply pipe, 44a: Connector, 45: Downward surveillance camera, 46: Drain pipe, 46a: Connector, 47: Hose, 48: Suction hose,
50: Fishing reef cleaning device, 51: Box body, 52: Hanging strap, 53: Ventilation pipe, 54: Chemical solution supply pipe, 55: Downward surveillance camera, 56: Chemical solution ejection pipe, 56a: Nozzle,
60: Fishing reef cleaning device, 61: Box, 62: Hanging strap, 63: Ventilation pipe, 64a, 64b: Electrodes, 65: Downward surveillance camera,
70: Fishing reef cleaning device, 71: Box body, 72: Hanging strap, 73: Vent pipe, 74a, 74b: Electrode, 75: Downward surveillance camera, 76: High pressure injection pipe

Claims (4)

A box body with the lower part open and the entire side and upper part closed is installed so as to cover from above the fishing reef installed on the seabed.
A method for cleaning an artificial reef, which comprises making the environment inside the box a state capable of killing marine organisms adhering to the surface of the artificial reef. A box that is open at the bottom and can cover the entire side and above of the fishing reef installed on the seabed.
A hanging strap to which a hanging material for lifting or lowering the box is joined from above the sea surface,
A ventilation pipe for injecting gas into the box body suspended and supported under the sea surface or inside the box body installed on the seabed or discharging gas from the inside of the box body.
A fish reef cleaning device characterized by having a fish reef position detecting means for detecting the position of the fish reef in a state of being supported by the box body and suspended above the fish reef installed on the seabed. In the box body installed so as to cover the entire lateral circumference and the upper side of the fish reef, marine organisms adhering to the surface of the fish reef exposed on the sea surface of the box body, or seawater in the box body. The fish reef cleaning device according to claim 2, further comprising an extermination means for killing marine organisms adhering to the surface of the fish reef under the surface. A liquid, a gas, or a mixture of a liquid and a gas is sprayed inside the box, or a granular solid is added to any of the liquid, a gas, and a mixture of a liquid and a gas and sprayed, and the surface of the fishing reef is sprayed. The fish reef cleaning device according to claim 2 or 3, further comprising a removing means for removing the marine organisms that have died in the above.

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